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SP6685 Datasheet Preview

SP6685 Datasheet

700mA Buck/Boost Charge Pump LED Driver

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June 2009
SP6685
700mA Buck/Boost Charge Pump LED Driver
Rev. 2.0.0
GENERAL DESCRIPTION
The SP6685 is a current-regulated charge
pump ideal for powering high brightness LEDs
for camera flash applications.
The charge pump can be set to regulated two
current levels for FLASH and TORCH modes.
The SP6685 automatically switches modes
between step-up and step-down ensuring that
LED current does not depend on the forward
voltage. A low current sense reference voltage
(50mV) allows the use of small 0603 current
sensing resistors.
The SP6685 is designed to operate from a
single cell lithium-ion battery or fixed 3.3V or
5.0V power rails and is available in a RoHS
compliant, “green”/halogen free space saving
10-pin 3mmx3mm DFN package.
TYPICAL APPLICATION DIAGRAM
APPLICATIONS
White LED Torch/Flash for Cell Phone,
DSCs and Camcorders
White LED Backlighting
Generic Lighting/Flash Application
General Purpose High Current Boost
FEATURES
Output Current up to 700mA
Up to 94% Efficiency in Torch Mode
Minimum External Components:
No Inductor
Adjustable FLASH Mode Current
1x and 2x Charge Pump Operation
2.4MHz High Frequency Operation
IQ < 1µA in Shutdown
Built-In Soft Start Limit Inrush Current
Output Overvoltage Protection
Over current/Temperature Protection
10pin 3x3mm DFN Package
Fig. 1: SP6685 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001




Exar

SP6685 Datasheet Preview

SP6685 Datasheet

700mA Buck/Boost Charge Pump LED Driver

No Preview Available !

SP6685
700mA Buck/Boost Charge Pump LED Driver
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
VIN, VOUT ................................................... -0.3V to 6.0V
Output Current Pulse (FLASH) .................................... 1A
Output Current Continuous (TORCH)........................ 0.4A
VEN .................................................................0V to 7V
Storage Temperature .............................. -65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 260°C
ESD Rating EN pin (HBM - Human Body Model) .......... 1kV
ESD Rating All Other Pins (HBM) .............................. 2kV
OPERATING RATINGS
Input Voltage Range VIN...............................2.7V to 5.5V
Operating Temperature Range ................... -40°C to 85°C
Thermal Resistance θJA ................................... 57.1°C/W
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of TJ = 25°C only; limits applying over the full
Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for
reference purposes only. Unless otherwise indicated, VIN = 3.6, CIN = 4.7µF, CFC = COUT = 1µF. TA= –40°C to 85°C.
Parameter
Operating Input Voltage
Min.
2.7
Quiescent Current
Shutdown Current
Oscillator Frequency
Charge Pump Equivalent
Resistance (x2 Mode)
Charge Pump Equivalent
Resistance (x1 Mode)
FB Reference Voltage
FB Reference Voltage
FB Pin Current
EN, Flash Logic Low
EN, Flash Logic High
EN, Flash Pin Current
VOUT Turn-on Time
Thermal Shutdown Temperature
138
45
1.3
Typ.
0.5
2
2.4
5
0.6
150
50
250
145
Max.
5.5
3
1
0.8
162
55
0.5
0.4
0.5
500
Units
V
mA
µA
MHz
Ω
Ω
mV
mV
µA
V
V
µA
µS
oC
Conditions
VIN = 2.7 – 5.5V FLASH = 0V
ILOAD = 100 µA
FLASH = VIN, 2x Mode
VIN = 5.5V, VEN = 0V
VFB = 0V, VIN = 3.6V
VIN = 3.6V
• FLASH = VIN, RSET = 88.7K
• FLASH = GND
VFB = 0.3V
• VIN = 3.6V, FB within 90% of regulation
© 2009 Exar Corporation
2/14
Rev. 2.0.0


Part Number SP6685
Description 700mA Buck/Boost Charge Pump LED Driver
Maker Exar
Total Page 14 Pages
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